Cold insulation pallet

Abstract

To provide a cold insulation pallet which enables transportation and exhibition of a cold storage object while refrigerating the cold storage object to keep it at a predetermined temperature without needing a large scale device such as a refrigeration cycle.SOLUTION: A cold insulation pallet includes: a bottom surface part on which a plurality of cold storage objects may be placed; a wall part which is integrally formed at a periphery of the bottom surface part and forms a placement space for placing the cold storage objects; a cavity part formed on at least the bottom surface part; a ventilation part which is provided at one end of the cavity part and suctions air from the placement space to the cavity part; a cooling part which cools air in the cavity part; and a discharge port which is provided at the other end of the cavity part and discharges air cooled by the cooling part toward the placement space.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a refrigerated pallet on which an object to be refrigerated is placed and kept cool. [Background technology]

[0002] In the logistics of fresh produce such as vegetables, a cold chain is known in which the produce is transported while being kept refrigerated. After transporting the fresh produce, they are sometimes sold in a display state.

[0003] Thus, there exists a cold storage container that can keep food and other items that require low-temperature storage cold for a long time even when they are left outdoors. Patent Document 1 discloses a cold storage body and a cold storage method. The cold storage body has multiple cavities formed inside a main body (structured with multiple square timbers lined up) with high thermal conductivity on which the items to be kept cold are placed, and cold storage materials are hermetically stored in the cavities. A refrigerant is injected into the cold storage material, and the entire main body can be cooled to a predetermined temperature. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-346513 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, establishing a cold chain generally requires large-scale equipment such as a refrigeration cycle. Therefore, it is difficult to establish a cold chain in small-scale logistics such as that of local industries due to the cost. In addition, when displaying and selling fresh produce in local industries, it is difficult to control the temperature at the location, making it difficult to maintain the freshness of the fresh produce.

[0006] Therefore, the present invention aims to provide a refrigerated pallet that does not require large-scale equipment such as a refrigeration cycle and can simultaneously transport and display items (fresh produce such as vegetables) while keeping them at a specified temperature. [Means for solving the problem]

[0007] According to the present invention, the refrigerated pallet comprises a bottom portion on which a plurality of refrigerated objects can be placed, a wall portion formed integrally around the bottom portion to form a loading space in which the plurality of refrigerated objects can be placed, a hollow portion formed in at least the bottom portion, a blower portion provided at one end of the hollow portion for drawing air from the loading space into the hollow portion, a cooling portion for cooling the air in the hollow portion, and an exhaust port provided at the other end of the hollow portion for discharging the air cooled by the cooling portion toward the loading space. Effect of the Invention

[0008] According to the present invention, it is possible to transport and display items (perishable goods such as vegetables) while keeping them at a predetermined temperature without requiring a large-scale device such as a refrigeration cycle. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view showing a configuration of a cold storage pallet according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a partially cross-sectional side view of a refrigerated pallet according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a diagram showing the configuration of a cooling unit using a Peltier module that is applied to a refrigerated pallet according to an embodiment of the present invention. [Figure 4] FIG. 2A is a perspective view of a refrigerated pallet according to an embodiment of the present invention with legs attached, and FIG. 2B is a partial cross-sectional view of the legs of the refrigerated pallet according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of a refrigerated pallet according to the present invention will be described with reference to the accompanying drawings. Fig. 1 is a cross-sectional view showing the configuration of a refrigerated pallet 1 according to an embodiment of the present invention. Fig. 2 is a partially cross-sectional side view of the refrigerated pallet 1. The refrigerated pallet 1 has a box shape with an open top overall, and includes a bottom portion 10, a wall portion 20, a hollow portion 30, a blower portion (fan module) 40, a plurality of cooling portions 50, and a plurality of legs 60.

[0011] As shown in FIG. 2, multiple handles K may be provided on the upper end side of the wall portion 20 in the width direction of the refrigerated pallet 1. Also, the legs 60 may be omitted from the refrigerated pallet 1, and multiple refrigerated pallets 1 may be stacked on top of each other. Multiple refrigerated pallets 1 may be stacked flat and stored in a warehouse or displayed outdoors. Furthermore, a cover may be provided to cover the top of the refrigerated pallet 1. The cover is effective in covering multiple refrigerated objects placed in the placement space to isolate them from the outside air.

[0012] The bottom portion 10 is a rectangular base having an area large enough to place a plurality of items to be kept refrigerated (such as fresh produce). The wall portion 20 is integrally formed around the periphery of the bottom portion 10 and rises vertically from the periphery of the bottom portion 10 at a predetermined height. It is not necessary to form the wall portion 20 along the four sides (two long sides and two short sides) of the rectangular bottom portion 10. As shown in Figs. 1 and 2, it is sufficient to form the wall portion 20 on at least adjacent or opposing sides of the bottom portion 10. Note that the material for the bottom portion 10 and the wall portion 20 may be a plate material with a heat insulating material formed on the inside of a plastic or foaming agent.

[0013] The bottom surface portion 10 and the wall portion 20 form a cubic space. This space is a placement space having a volume capable of placing and keeping a plurality of cold objects cold. The volume of the placement space is determined by the length LN1 (e.g., 550 mm) of the long side of the bottom surface portion 10, the length LN2 (e.g., 350 mm) of the short side of the bottom surface portion 10, and the height H (150 mm) of the wall portion 20, and is expressed as "LN1×LN2×H" (mm 3It is also possible to stack a plurality of cooling pallets 1 and place them flat, and the values ​​of the length LN1, length LN2, and height H, which indicate the volume of the placement space, may be set arbitrarily.

[0014] 1, the hollow portion 30 is formed in an L-shape in cross section extending from the inside of the bottom surface portion 10 to the inside of a predetermined wall portion 20. However, the shape of the hollow portion 30 is not limited to this. It is sufficient that the hollow portion 30 is formed inside the bottom surface portion 10 and that the air inside the hollow portion 30 can be cooled by a plurality of cooling portions 50. The dimensions of the hollow portion 30 can be set arbitrarily, but it is sufficient that the dimensions are such that a flow of cooling air sufficient to keep the placement space cool is generated.

[0015] One end of cavity 30 is an inlet IN for drawing in air, and the other end is an outlet OUT for discharging air. In Fig. 1, the inlet IN of cavity 30 corresponds to one end of bottom surface 10, and its height h1 corresponds to the lower end of wall 20. The outlet OUT of cavity 30 is formed on the upper end side of wall 20 with a height h2.

[0016] A corner ring CN is formed above the exhaust outlet OUT of the cavity 30 formed at the upper end of the wall 20. The provision of the corner ring CN increases the volume of air (cold air) ejected from the exhaust outlet OUT and directed toward the wall 20 facing the wall 20 having the exhaust outlet OUT. This is expected to form an air curtain above the placement space of the refrigerated pallet 1. The corner ring CN also redirects the airflow exhausted from the exhaust outlet OUT to a horizontal direction. The corner ring CN imparts a certain load to the airflow, allowing it to be smoothly exhausted in the desired direction. The shape and angle of the corner ring CN are set to optimal values ​​based on experience and experimental values.

[0017] The blower 40 is provided at the inlet IN of the cavity 30 and draws air from the placement space into the cavity 30. A small fan module that is powered by a DC power source and operates at a constant rotation speed may be used as the blower 40. The blower 40 is designed to circulate air at a desired speed through a flow path from the inlet IN to the outlet OUT of the cavity 30. If the airflow speed is high, convection will occur in the placement space, which may reduce the cooling effect of the placement space. If the airflow speed is low, the cold air discharged from the outlet OUT will dissipate and the air curtain effect will not be achieved. For this reason, the blower speed of the blower 40 is set to an optimal value based on experience and experimentation.

[0018] It is also possible to modify this embodiment and extend the flow path of the cavity 30 upward from one end of the bottom surface portion 10 along the wall portion 20, and provide the intake port IN at a predetermined height of the wall portion 20 on one end side of the bottom surface portion 10. In this case, the height h1 at which the blower portion 40 is installed is large. It is preferable that the height h1 of the blower portion 40 is lower than the height h2 of the exhaust portion OUT of the cavity 30. If the position of the blower portion 40 is high, it may suck in outside air above the bottom surface portion 10, and the cooling effect of the cooling portion 50 may decrease. In addition, the flow path of the cavity 30 becomes U-shaped instead of L-shaped in cross section, the flow path length becomes longer, and the flow path resistance also increases. In order to keep the speed of the air flow in the cavity 30 constant, it is necessary to increase the air volume of the blower portion 40, which increases power consumption. For this reason, in this embodiment, the blower portion 40 is provided at the intake port IN of the cavity 30 formed at a low height h1 on one end side of the bottom surface portion 10.

[0019] In this embodiment, a plurality of cooling parts 50 are arranged in a line along the longitudinal direction of the bottom surface part 10 (corresponding to the length LN1 of the long side shown in FIG. 1). For example, the number of cooling parts 50 may be two to three with respect to the longitudinal length LN1 of the bottom surface part 10. In FIG. 1, three cooling parts 50 (50a, 50b, 50c) are arranged. However, the number of cooling parts 50 is not limited, and may be changed according to the cooling capacity of the cooling parts 50 and the longitudinal length LN1 of the bottom surface part 10. In addition, a plurality of cooling parts 50 may be arranged along the width direction of the bottom surface part 10 (corresponding to the length LN2 of the short side shown in FIG. 2).

[0020] Unlike this embodiment, it is also possible to consider a configuration in which an aluminum plate bonded with a Peltier module (described later) is laid on the bottom surface of the refrigerated pallet 1. However, in this configuration, the aluminum plate only cools, and a layer of cold air that covers the placement space cannot be created. Therefore, in this embodiment, the air blower 40 is placed at a predetermined position to cause air circulation, thereby creating a layer of cold air that covers the placement space of the refrigerated pallet 1.

[0021] The cooling unit 50 is composed of a heat sink HS (e.g., an aluminum heat sink) and a Peltier module PM. In Fig. 1, the cooling units 50a, 50b, and 50c are provided with heat sinks HS1, HS2, and HS3 and Peltier modules PM1, PM2, and PM3. In Fig. 1, the heat sinks HS1, HS2, and HS3 are disposed at regular intervals along the bottom surface 10 in the cavity 30.

[0022] Generally, Peltier modules consist of a P-type semiconductor and an N-type semiconductor sandwiched between two metal plates, and generate heat transfer in response to the flow of electric current. When electrons move from the metal to the N-type semiconductor, they absorb energy and lower the temperature of the metal, and when electrons move from the N-type semiconductor to the metal, they release energy and raise the temperature of the metal. P-type semiconductors cause the opposite phenomenon to N-type semiconductors. In this way, heat is released and absorbed in response to the flow of electric current through the metal.

[0023] In this embodiment, heat dissipation HR (HR1, HR2, HR3) of the Peltier modules PM (PM1, PM2, PM3) occurs toward the outside of the bottom surface portion 10. In addition, heat absorption ET (EH1, EH2, EH3) of the Peltier modules PM (PM1, PM2, PM3) occurs toward the heat sinks HS (HS1, HS2, HS3) arranged in the cavity portion 30.

[0024] FIG. 3 shows an example of the configuration of the cooling unit 50 using the Peltier module PM arranged along the bottom surface 10 of the refrigerated pallet 1 according to this embodiment. The Peltier module PM is sandwiched between the cooling plate CP and the heat dissipation fin RF, and the cooling plate CP is joined to the heat sink HS to generate heat absorption ET. In general, natural heat dissipation increases the outside air temperature around the heat dissipation fin RF, which may hinder the cooling effect of the Peltier module PM. For this reason, a heat dissipation fan F may be provided below the heat dissipation fin RF of the Peltier module PM. In FIG. 3, the air A1 on the left side and the air A2 on the right side are collected by the heat dissipation fan F and blown downward as air A3, and the amount of heat generated by the heat transfer of the Peltier module PM is forcibly dissipated.

[0025] The Peltier module PM and the heat dissipation fan F of the cooling unit 50 shown in FIG. 3 are operated by a DC voltage (for example, a rated voltage of 12V or 24V). The cooling capacity varies depending on the specifications of the Peltier module PM, but for example, when the object to be cooled is a fresh product such as vegetables, it is sufficient to cool it by about 5° compared to the outside air temperature. A DC power source that applies a DC voltage to the blower unit 40 and a DC power source that applies a DC voltage to the cooling unit 50 may be provided separately. Alternatively, a single DC power source may be divided or stepped down to supply an optimal voltage to both of them depending on the specifications of the small fan constituting the blower unit 40 and the specifications of the Peltier module PM constituting the cooling unit 50. In addition, when the cooling pallet 1 is mounted on a vehicle, the blower unit 40 and the cooling unit 50 may be operated from a 12V power source such as a cigarette lighter socket without a transformer.

[0026] Returning to FIG. 1, the air circulation in the cavity 30 formed along the longitudinal direction of the refrigerated pallet 1 will be described. The blower 40 takes in air from the placement space and generates an airflow AF1 in the cavity 30. The speed of the airflow AF1 is based on the predetermined air volume during rated operation of the blower 40. The airflow AF1 flows horizontally along the bottom surface 10 and is sequentially cooled by the heat sinks HS1, HS2, and HS3 of the cooling units 50a, 50b, and 50c. That is, the airflow AF1 is cooled and becomes an airflow AF2 (cold air). After that, the flow of the airflow AF2 changes from the cavity 30 along the bottom surface 10 to the wall 20 and becomes an airflow AF3. The airflow AF3 is exhausted from the exhaust port OUT of the cavity 30 and blown into the upper part of the placement space. This lowers the temperature of the placement space and produces an air curtain effect.

[0027] Returning to Fig. 2, we will explain the circulation of cold air in the width direction of the refrigerated pallet 1. Heat absorption ET of the Peltier module PM constituting the cooling unit 50 generates cold air C1 by the heat sink HS. The cold air C1 is dispersed into cold air C2 and cold air C3 to keep the placement space at a predetermined temperature.

[0028] FIG. 4(A) is a perspective view of a configuration in which four legs 60 are provided at the bottom of a box-shaped refrigerated pallet 1. In FIG. 4(A), first legs 60a and 60b are provided on a first short side of the refrigerated pallet 1, and second legs 60c and 60d are provided on a second short side of the refrigerated pallet 1. As shown in FIG. 1, the height h3 extending from the bottom surface 10 of the legs 60 to the outside indicates the height when the refrigerated pallet 1 is installed on a flat surface such as a stand or a floor. The four legs 60a, 60b, 60c, and 60 may have the same length, or may have different heights. For example, the length of the second legs 60c and 60d may be shorter than the length of the first legs 60a and 60b. In this case, the bottom surface 10 of the refrigerated pallet 1 is arranged at an angle, but when multiple refrigerated objects are displayed, the inside of the mounting space is easily visible to the purchaser, which is effective for displaying multiple refrigerated objects.

[0029] FIG. 4(B) shows a structure in which the legs 60 are foldable. As shown in FIG. 4(B), the legs 60 may be oscillated in the direction D1-D2 with respect to the rotation axis RT. By raising the legs 60 in the direction D1, the bottom surface 10 of the refrigerated pallet 1 is supported on a plane via the legs 60. In this case, a heat dissipation space can be formed between the bottom surface 10 of the refrigerated pallet 1 and the plane on which the refrigerated pallet 1 is installed, depending on the length of the legs 60. This makes it easier to dissipate heat from the cooling unit 50 provided on the bottom surface 10. When the legs 60 are folded in the direction D2, the legs 60 can be stored on the side of the bottom surface 10 of the refrigerated pallet 1. When all four legs 60 are folded in the direction D2, the legs 60 do not protrude from the bottom of the refrigerated pallet 1, and multiple refrigerated pallets 1 can be stacked vertically.

[0030] For example, the first legs 60a, 60b may be raised in the direction D1, and the second legs 60c, 60d may be tilted in the direction D2. In this case, the first short side can be held higher than the second short side. This allows the entire refrigerated pallet 1 to be tilted, making it easier to display multiple refrigerated items stored in the placement space.

[0031] As described above, the refrigerated pallet 1 according to the present embodiment includes a bottom surface portion 10 on which a plurality of objects to be refrigerated can be placed, a wall portion 20 integrally formed around the bottom surface portion 10 to form a placement space on which a plurality of objects to be refrigerated can be placed, a hollow portion 30 formed in the bottom surface portion, a blower portion 40 for sucking air into the hollow portion 30, a cooling portion 50 for cooling the air in the hollow portion 30, and an outlet OUT provided at the other end of the hollow portion 30 for discharging the air cooled by the cooling portion 50 toward the placement space. The hollow portion 30 does not need to be formed in the bottom surface portion 10. The hollow portion 30 can also be formed in the wall portion 20. The hollow portion 30 may also be formed from the bottom surface portion 10 to the wall portion 20.

[0032] With the above configuration, the airflow cooled by the cooling unit 50 cools the wall 20 while the cooled air is discharged into the placement space from the outlet OUT provided at the upper end of the wall 20, forming a cooling layer in the placement space. Therefore, the object to be cooled placed in the placement space can be displayed outdoors while being maintained at a predetermined temperature (for example, a temperature about 5° lower than the outside air temperature).

[0033] In the refrigerated pallet 1, the wall portion 20 may include a first wall portion and a second wall portion rising from at least two sides of the rectangular bottom surface portion 10. In this case, the blower portion 40 may be provided inside the first wall portion, and the exhaust outlet OUT may be provided in the second wall portion. In other words, the hollow portion 30 may be formed in a U-shape in cross section along the first wall portion, the bottom surface portion 10, and the second wall portion. Specifically, the blower portion 40 may be provided at a first height relative to the first wall portion, and the exhaust outlet OUT may be provided at the upper end of the second wall portion at a second height higher than the first height.

[0034] With the above configuration, the cooling unit 50 cools the wall unit 20 while cooling the bottom surface unit 10, and discharges the cooled air from the exhaust port OUT of the cavity 30 into the mounting space to form a cold air layer. Since the second height of the exhaust port OUT of the cavity 30 is higher than the first height of the blower unit 40 installed at the intake port IN of the cavity 30, the range over which the cooled air is blown is increased, and the cold air layer can be formed efficiently. In addition, the blower unit 40 draws in the cooled air in the mounting space and flows it into the intake port IN of the cavity 30, thereby improving the cooling efficiency.

[0035] The refrigerated pallet 1 may be provided with a plurality of legs 60 that support the bottom portion 10 at a predetermined height on a flat surface. As a result, the refrigerated pallet 1 is supported on a flat surface such as a floor or a stand by the legs 60, so that the refrigerated pallet 1 can be placed outdoors while ensuring ease of placement, and heat from the cooling portion 50 can be dissipated into an open-to-air space.

[0036] In the refrigerated pallet 1, the cooling unit 50 may include a heat absorption unit that absorbs heat from the air in the cavity 30, and a heat dissipation unit that dissipates heat to the outside air outside the placement space. The heat dissipation unit may be exposed to an open-to-air space formed by the lower surface of the bottom unit 10 supported by multiple legs 60 and a flat surface such as a floor or a stand.

[0037] The multiple legs 60 may include first legs (60a, 60b) that support a first edge side of the bottom portion 10 and have a first length, and second legs (60c, 60d) that support a second edge side opposite the first edge side of the bottom portion 10 and have a second length shorter than the first length.

[0038] With the above configuration, the cold storage pallet 1 is supported on a flat surface with a predetermined inclination. For example, the exhaust outlet OUT side of the hollow portion 30 can be held at a higher position than the blower portion 40, and a cold air layer can be efficiently formed in the placement space. In addition, since the heat discharged from the heat dissipation portion of the cooling portion 50 can be released upward, it is possible to prevent heat from accumulating in the space between the bottom surface of the cold storage pallet 1 and the flat surface.

[0039] In the refrigerated pallet 1, the cooling section 50 may be composed of a plurality of cooling modules arranged along the hollow section 30 of the bottom section 10. In addition, the bottom section 10 and the wall section 20 may form a mounting space that is open upward.

[0040] With the above-mentioned configuration, multiple cooling modules are arranged along the hollow portion 30 of the bottom portion 10 of the refrigerated pallet 1, so that the desired cooling effect can be maintained even when the upper part of the loading space is uncovered and open.

[0041] The multiple cooling modules that constitute the cooling section 50 of the refrigerated pallet 1 may each be composed of an aluminum heat sink HS placed in the hollow portion 30 of the bottom portion 10, and a Peltier module PM that absorbs heat from the air in the hollow portion 30 of the bottom portion 10 via the aluminum heat sink HS.

[0042] With the above configuration, multiple cooling modules, each of which combines an aluminum heat sink HS and a Peltier module PM, are arranged along the bottom surface 10 of the cavity 30, so the design can be changed according to the desired cooling performance by, for example, changing the number of cooling modules according to the performance of the Peltier module PM. This allows the cooling performance to be adjusted according to the size of the refrigerated pallet 1 and the type of object to be refrigerated, increasing the degree of freedom in the design of the refrigerated pallet 1.

[0043] The present invention is not limited to the above-described embodiment. The length and shape of the cavity 30 of the refrigerated pallet 1, the position (height) of the air blower 40, the number and arrangement of the multiple cooling units 50, the presence or absence of the legs 60, and the like can be arbitrarily determined based on experience or experimental values. In this embodiment, the Peltier module PM is applied to the cooling unit 50, but the present invention is not limited to this. Other elements or devices capable of cooling may be applied to the cooling unit 50.

[0044] For example, when multiple refrigerated pallets 1 are stacked vertically, the cooling section 50 (Peltier module PM) may be provided in the cavity 30 formed in the wall section 20, rather than in the cavity 30 formed in the bottom section 10. This is because if the heat dissipation section of the Peltier module PM is exposed at the bottom of the bottom section 10 of the refrigerated pallet 1, it will impede the cooling performance of other refrigerated pallets 1 placed below.

[0045] In addition, when the lengths of the four legs 60 of the refrigerated pallet 1 are made uniform, the length of the legs 60 is preferably about twice the height of the heat dissipation part of the Peltier module PM (the height of the heat dissipation part exposed from the bottom surface part 10 of the refrigerated pallet 1). If the length of the legs 60 is short, heat may be trapped in the space between the bottom surface part 10 and the support surface. On the other hand, if the length of the legs 60 is long, the transportability of the refrigerated pallet 1 is affected. For this reason, the length of the legs 60 of the refrigerated pallet 1 needs to be adjusted in consideration of the heat dissipation performance of the Peltier module PM. In this embodiment, the length of the legs 60 is fixed, but the length of the legs 60 may be adjustable. In addition to the collapsible type shown in FIG. 4(B), a retractable type having a storage part for the legs may be used.

[0046] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0047] 1 Cooling pallet 10 Bottom part 20 Wall 30 Cavity 40 Blower section (fan module) 50, 50a, 50b, 50c cooling section 60 Legs HS, HS1, HS2, HS3 Heatsinks PM, PM1, PM2, PM3 Peltier Modules

Claims

1. A bottom surface portion on which a plurality of objects to be kept cold can be placed; A wall portion integrally formed around the bottom surface portion to form a placement space for placing the plurality of objects to be kept cold; A cavity formed at least in the bottom surface portion; a blower provided at one end of the hollow portion and configured to draw air from the placement space into the hollow portion; a cooling unit that cools the air in the cavity; an exhaust port provided at the other end of the hollow portion and configured to exhaust the air cooled by the cooling portion toward the placement space; A cooling pallet comprising:

2. The bottom surface portion is formed in a rectangular shape, The wall portion includes a first wall portion and a second wall portion rising from at least two sides of the rectangular shape of the bottom surface portion, 2. The refrigerated pallet according to claim 1, wherein the cavity extends from an inside of the first wall portion of the wall portion through an inside of the bottom portion to an inside of the second wall portion of the wall portion.

3. The blower is provided inside the first wall portion of the wall portion, The cooling section cools the air in the hollow section of the bottom section, The refrigerated pallet according to claim 2 , wherein the outlet is provided in the second wall portion of the wall portion.

4. The air blowing section is provided at a first height relative to the first wall portion of the wall surface, 4. The refrigerated pallet according to claim 3, wherein the outlet is provided at an upper end of the second wall portion of the wall at a second height higher than the first height.

5. 2. The refrigerated pallet according to claim 1, further comprising a plurality of legs for supporting the bottom surface at a predetermined height on a flat surface.

6. the cooling unit includes a heat absorbing unit that absorbs heat from the air in the cavity and a heat dissipating unit that dissipates heat to the outside air outside the placement space, 6. The refrigerated pallet according to claim 5, wherein the heat dissipation portion is exposed to an open-to-air space formed by the lower surface of the base portion supported by the plurality of legs and the flat surface.

7. 6. The refrigerated pallet according to claim 5, characterized in that the plurality of legs include a first leg having a first length supporting a first edge side of the bottom portion, and a second leg having a second length shorter than the first length supporting a second edge side opposite to the first edge side of the bottom portion.

8. the cooling section is composed of a plurality of cooling modules arranged along the hollow portion of the bottom surface portion, 2. The refrigerated pallet according to claim 1, wherein the bottom portion and the wall portion form the storage space that is open upward.

9. 9. The refrigerated pallet according to claim 8, wherein each of the plurality of cooling modules is composed of a heat sink disposed in the cavity of the bottom portion, and a Peltier module that absorbs heat of air in the cavity of the bottom portion via the heat sink.

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